you can get used buckets from Farr's Ice cream (lid and bucket) for $2.5. They are in great condition and prefect for wheat or sugar or salt and such
just call them and tell them how many buckets you would like to order

i have heard that plastic bottles are bad to reuse/wash as they might end up containing toxins - and add on top of that, what would adding the drop or 2 of clorox do to the toxicity of the water?

Most cities have chlorine in their drinking water systems, it's there to kill off bacteria.
You probably started drinking chlorine purified water soon after you were born.
Unless of course, you have lived on natural spring or well water your entire life.

Survival Solutions is a great place for lots of emergency prepardness items. survivalsolutions.com or buildings in Springville and Layton. Become a fan on Facebook and you can see their "Deal of the Day" that isn't available any other way. They are also VERY knowledgable if you have questions about anything.